How many times have the philadelphia and Oakland a's won the world series?

The Philadelphia Athletics won the World Series a total of five times, with championships in 1910, 1911, 1913, 1929, and 1930. The Oakland Athletics, after relocating to California, have won the World Series four times, in 1972, 1989, 1990, and 2000. In total, the franchise has won nine World Series titles when combining both the Philadelphia and Oakland eras.